Steam trap



Dec. 3o, 1930. E.; HEwm n 1,787,374

STEAM TRAP Filed June 16. 1928 2 Sheets-Sheet 1 .9 .0 :I .10 'Q1 i g z v.. f 7 1 fz l y gglxfrifz/g//l/l/g y (//l ///l "gli rl.: l.. r lll -l'l ATTORNEY Dec. 30, 1930.

STEAM TRAP Filed June 16. 1928 2 Sheets-Skaai. 2

Patented Dec. 30, 1930 y UNITED STATES EDMUND T. HEWITT, OF ST. LOUIS, MISSOURI STEAM 'naary Application filed June 16,

This invention relates to a steam trap for condensed water from a steam heating plant designed to eifect quick release by a simple release mechanism.

- '5 In carrying out the invention, I provide an air tight trap, having pivotally supported therein a ioat to follow the level of the condensed water with means as to predetermine the rise of the water level to release a latch 1o and permit an auxiliary float to actuate a balanced piston to quickly open a drain port and permit escape of the condensed water.

The several features of novelty will be more fully hereinafter described and will be de- 15 nitely indicated in the appended claims.

In the accompanying drawings illustrating the invention- A Figure 1 is a median vertical section of a trap embodying my improvements.

Figure 2 is a horizontal section. on the plane 2 2 of Figure 1.

Figure 8 is an enlarged section of a cylinder and piston for operating the drain, on the plane 3 8 of Figure 1.

Figure 4 is an enlarged section of the cylinder on the plane 4 4 of Figure 1.

Figure 5 is a side view of the trip arm for the'piston.

Referring now in detail to the drawingsso 1 represents a cylindrical trap mounted by a screw thread on a base 2, having a plurality of bolted feet 3. On the top of the trap is a flanged ring 4, connected with the cylinder by a screw thread. On a flange of the threaded annular member -4l is bolted a dome-like top plate 5 having an inlet 7, provided with a screw threaded joint to accommodate an inlet pipe 6 for condensed steam. The top plate has a plurality of ports 8 permitting discharge into the cylinder 1. A pet cock 9 controls escape of air to permit the water Vlevel to rise and is mounted in a tubular extension of the dome 10 carrying a spider 11 to guide the controlled rod 12. Collars 1? 13a are adjustably mounted on the rod 12 to permit a limited movement of a pivoted rod 14 Supported on a standard 17 and provioed with a trip latch 15 cooperating with a notch 15a in a bell crank lever 16, pivoted on the stand 17. The float 18 is mounted in slid- 192s. Semaine. 286,037.

ingrelationon the rod 12 so` as to follow the level of the condensed water, and when said level reachesthe limit to engage the adjustable collar 18, the latch 15 is released permitting a float 19 to rise against the tension of-af spring Sea-ted in a standard 21, is a rounded nose of the threaded Spring pressed pin 29, being in alinement with the arm 16 of the elbow lever controlling the piston rod 22. y

Mounted on the piston rod is a hollow piston 23 normally pushed to the rear of a cylinder 24 in close relation to the cylinder head 25. The'cylinder 24 carries a drain pipe 26, provided with ducts leading to opposite sides of the piston and in normal position in communication with the condensed water in equalized pressure on both sides of the piston. The piston carries a ported piston ring 28, carrying a plurality offports 28a, which when the-piston rod. 22 is shifted forward brings theports into register with the drain opening 27, communicating with the drain pipe 26. In this position ofthe pi-ston, the water also passes through the latter and is discharged through the passage 27a which also communicates with the drain pipe 26. In a normal position however, these ports are covered and both sides of the piston have an equalized pressure of the hydraulic head of the condensed water. lhen the water lever 1 rises suflicient to engage the collar 13 by the float 18, the latch 15 releases the bell crank lever 16, -and permits the float 19 to shift the piston into register with the drain port 27, thereby permitting the condensed water to escape. This action will be instantaneous and withdraw the condensed water as float 18 sinks to the lower collar 13a and the spring 2() retracts and lowers the float 19'to contact with the base and the collar 13a in the rod 12 causes re-engagement of the latch 15 to restore the trigger action. During this operation the piston has been shifted under the strength of the spring 2O into normal position, indicated in Figure 1. When the action again proceeds as before described causing a gradual rising of the float 18 from the lower limit of the collar 13a and gradually shifting the float 18 along the rod as the for condensed water, a recprocable pistonv O Vcontrolling a drain in vthek bottom thereof, a Y

float actuated on a drainage'ofwater from 5 the trap to control said piston, an arm actu-k ated by the lioat to lopen a vent in the drain,

water accumulates until a re-engagement with the collar 13, a new discharge of the condensed Vwater will be efl'ect scribed. Y Y

Having thus described my invention, what I claim is new and desire to secure by Letters Patent is l v Y Y 1. L steam trap Vcomprising a reservoir an auxiliary float on a verticall rod. in slidable relation'to the arm, a latch controlling the piston, and apair of -fiXed collars on the l rodzat different fluid levels toengagey the auxiliary float andv set or -unset thelatch to control the drain. 1

26T; ,2.V A steam trap comprising a reservoir for 25; one end connected with the piston rod, afloat v condensed water,and including a cylindrical extension havlngwa drainvopening, a piston operating kin said extension and controlling`V said1 opening, a pivoted bell crank lever having carried bythe other end thereof, a latch cooperating with saidllever for holding said y piston normally positioned to cover said drain opening, adjustableoat actuated means for .i eli'ecting arelease ofs'aid lever at a predeter K mined .water level, whereupon said lever is actuated bythe float carried thereby to shift said-pistonaway from the drain opening, and

resilient means engaging said lever and auto `Pinatically returning :said piston to normal `position with the fall ofthe level within the reservoir;

In testimony whereof aliX mysignature. fr Y llilDMUNDT. HEWITT;

v55;l 60' l ed, as before de- A of water 

